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Eccentric radial piston pump and eccentric radial piston motor

A technology of radial piston pumps and electric motors, applied in piston pumps, machines/engines, pumps, etc., can solve problems such as larger dimensions, and achieve the effect of improving rigidity and preventing deformation

Inactive Publication Date: 2008-04-23
KOMATSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, if the wall thickness of the eccentric cam ring is made thick, there will be a problem that the external dimensions in the radial direction of the eccentric type radial piston pump or the eccentric type radial piston motor will become large.

Method used

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  • Eccentric radial piston pump and eccentric radial piston motor
  • Eccentric radial piston pump and eccentric radial piston motor
  • Eccentric radial piston pump and eccentric radial piston motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] FIG. 1 is a schematic longitudinal sectional view of an eccentric radial piston pump 1 according to an embodiment of the present invention. FIG. 2 shows a longitudinal sectional view of the eccentric cam ring 3 . As shown in FIG. 1 , an eccentric cam ring 3 is arranged inside the housing 2 , and a rotatable cylinder 4 is arranged inside the eccentric cam ring 3 . A plurality of cylinder bores 7 are formed in the radial direction in the cylinder block 4 , and a slidable piston 5 is arranged in each cylinder bore 7 .

[0049] A freely swingable piston shoe 6 is supported on the piston 5 . The piston shoe 6 is in sliding contact with the cam surface 3A of the eccentric cam ring 3 and slides on the cam surface 3A as the cylinder 4 rotates. The piston 5 is reciprocated by sliding the piston shoe 6 on the cam surface 3A.

[0050] A pivot 8 provided on the housing 2 is fitted into a pivot insertion portion 9 of the cylinder 4 to rotatably support the cylinder 4 . A suction...

Embodiment 2

[0084] FIG. 11 is a schematic longitudinal sectional view of another eccentric radial piston pump 1 according to an embodiment of the present invention. As a configuration for eccentrically eccentric the cam ring 3, in the first embodiment, the eccentric cam ring 3 is eccentrically moved by the operation of the pistons 15a, 15b provided on the left and right sides of the housing 2.

[0085] In contrast, in Example 2, the engaging members 30, 31 are formed on the side surfaces of the rib 12 disposed on the eccentric cam ring 3, and the engaging members 30, 31 are acted on by the operating mechanisms 22, 23 that impart an eccentric amount. 31, and make the eccentric cam ring 3 eccentric.

[0086] In this structure, the structure of Embodiment 2 is different from that of Embodiment 1. Other structures are the same as in Embodiment 1. Therefore, for the same structure as that of the first embodiment, the same reference numerals are assigned to the same components, and descriptio...

Embodiment 3

[0100] FIG. 12 is a schematic longitudinal sectional view of an eccentric radial piston motor 32 according to an embodiment of the present invention. In Embodiment 3, the structure is the same as that of the eccentric radial piston pump 1 in Embodiment 1 except for the point that the structure of the eccentric radial piston motor 32 is shown. Therefore, for the same configuration as that of the eccentric radial piston pump 1 , the reference numerals used in FIG. 1 are assigned, and description thereof will be omitted.

[0101] In the eccentric radial piston motor 32 , the cylinder body 4 and the pivot shaft 33 are integrally rotating. Therefore, the passages of the pressure oil formed on the pivot shaft 33 communicating with the inlets and outlets 34 and 35 are respectively formed as passages of the same diameter.

[0102] Incidentally, in the eccentric type radial piston pump 1, the cylinder 4 rotates and the pivot 8 does not rotate. Therefore, in the pressure oil passage f...

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Abstract

An eccentric radial piston pump and an eccentric radial piston motor. In the eccentric radial piston pump, a rib (12) projected in the radial direction is formed on the delivery side end part inner peripheral surface of an eccentric cam ring (3) over a prescribed range. In the eccentric radial piston motor, a rib (12) projected in the radial direction is formed on the high-pressure side end part inner peripheral surface of the eccentric cam ring (3) over a prescribed range. The rigidity of the eccentric cam ring (3) is increased by the rib (12) formed in the radial direction to prevent the eccentric cam ring from being deformed by a thrust from a piston. Thus, the rigidity of the eccentric cam ring can be increased without increasing the wall thickness of the eccentric cam ring and the outside dimensions of the eccentric cam ring in the radial direction can be reduced in the eccentric radial piston pump and the eccentric radial piston motor.

Description

technical field [0001] The invention relates to an eccentric radial piston pump and an eccentric radial piston motor. Background technique [0002] In the eccentric type radial piston pump or the eccentric type radial piston motor, the center of the eccentric cam ring is eccentric to the rotation center of the casing of the radial piston pump or the eccentric type radial piston motor, and by changing the The amount of eccentricity is used to change the stroke of the piston in the cylinder. The capacity of the eccentric radial piston pump or the eccentric radial piston motor can be controlled to be variable by changing the stroke amount of the piston to change the displacement volume of the pressure oil of the piston. [0003] As an eccentric radial piston pump conventionally used, a structure as described in Patent Document 1 is used. In the eccentric radial piston pump described in Patent Document 1, the arrangement relationship between the control piston for driving the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B1/10
CPCF04B9/042F04B49/125F04B9/045F04B1/0413F04B1/07F04B1/06F04B1/1071F04B1/10
Inventor 森野健治中川忠饭谷英史
Owner KOMATSU LTD